This afternoon I received my Nikon to MFT adapter. I mounted my 105mm f2.5 Ais on the adapter and shot two test images. After that I wanted to dismount the lens from the adapter. Seems it is stuck somehow. There is a chrome lever on the adapter which activates a little pin, this seems to unlock something but no movement unfortunately. The aperture ring on the lens is stuck also. Which way should I turn the adapter (facing down) to unlock? Any help appreciated.